This Anaphylaxis UK video explains recognising a life-threatening allergic reaction using the ABCDE approach. Severe allergy to food, insect stings, prescribed drugs or latex can cause different combinations of symptoms, so consider the signs together rather than waiting for a single presentation.

Airway signs include hoarseness, swollen tongue and itching or swelling in the throat. Breathing signs include shortness of breath, wheeze, noisy breathing, tiredness and, later, blue colouring around the mouth. Circulation signs include pale or clammy skin, a rapid or weak pulse, faintness, confusion or agitation, reduced consciousness, abdominal pain or vomiting.

Exposure signs include hives, nettle rash, and swelling of the lips, eyes, throat or other body parts. Check whether the person may have eaten or contacted a known allergen, although this may not always be obvious. The action message is to use the person's adrenaline auto-injector, call 999, and ensure they go to hospital after receiving adrenaline because monitoring is required.

This British Red Cross video demonstrates first aid for a choking child. Choking occurs when food or another object blocks the airway and the child cannot breathe, cough, cry or speak.

The demonstration shows leaning the child forward and giving firm back blows with the heel of the hand. If repeated back blows do not clear the airway, the presenter demonstrates abdominal thrusts from behind - a fist placed on the soft part of the abdomen above the belly button with a quick inward-and-upward movement to force air up through the airway.